Method and system of doppler correction for mobile communication

Details Method and system of doppler correction for mobile communication Method and system of doppler correction for mobile communication

1998-01-23

1999-11-30

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

455 63, 455296, 375348, G01S 352, G01S 502

Patent

active

059950455

ABSTRACT:
Doppler correction system and method comprising receiving a Doppler effected signal comprising a preamble signal (32). A delayed preamble signal (48) may be generated based on the preamble signal (32). The preamble signal (32) may be multiplied by the delayed preamble signal (48) to generate an in-phase preamble signal (60). The in-phase preamble signal (60) may be filtered to generate a substantially constant in-phase preamble signal (62). A plurality of samples of the substantially constant in-phase preamble signal (62) may be accumulated. A phase-shifted signal (76) may also be generated based on the preamble signal (32). The phase-shifted signal (76) may be multiplied by the delayed preamble signal (48) to generate an out-of-phase preamble signal (80). The out-of-phase preamble signal (80) may be filtered to generate a substantially constant out-of-phase preamble signal (82). A plurality of samples of the substantially constant out-of-phase signal (82) may be accumulated. A sum of the in-phase preamble samples and a sum of the out-of-phase preamble samples may be normalized relative to each other to generate an in-phase Doppler estimator (92) and an out-of-phase Doppler estimator (94).

REFERENCES:
patent: 3940695 (1976-02-01), Sickles, II
patent: 5007068 (1991-04-01), Simon et al.
patent: 5023889 (1991-06-01), Divsalar et al.
patent: 5229775 (1993-07-01), Sakamoto et al.
patent: 5432531 (1995-07-01), Siwiak et al.

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